Improved burglar-alarm



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E. C, C. KELLOGG, OF HARTFORD, CONNECTICUT, ASSIGNOR TO HIMSELF ANDTHEODORE HOYT.

Letters Patent No. 71,180, dated November 19, 1867.

IMPROVED BURGLAR-ALA RM.

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Be it knownthat I, E. C, G. Kunnoee, of Hartford, in the county ofHartford, and State of Connecticut, have invented a new and usefulImprovement in Burglar-Alarms; and I do hereby declare'that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, making a portion of thisspecification, in which- 4 Figure 1 is a plan view of a burglar-alarm,constructed according to my invention.

Figure 2 is a side view of the same.

Similar letters of reference indicate corresponding parts in bothfigures.

This invention consists in a toggle-brace, so combined with an armconnected with the striking mechanism of a burglar-alarm as toefi'ectually hold the said mechanism in position when wound up for use,and to furnish an eflicient means whereby the same may be tripped orstarted, to sound the alarm when acted upon by the operations of theburglar or other person.

To enable others to understand the construction and operation of myinvention, I will proceed to describe it with reference to-the drawings.4

Within a rectangular or other suitable case, A, is the strikingmechanism of the alarm, which may consist, as shown in dotted outline infig. 1,of a spur-wheel, B, rotated, when the device is in operation, bya suitable spring in the direction of the arrow marked'thereon in thefigure aforesaid, and gearing into a pinion attached to the shaft a ofthe escape-wheel C, the latter operating the anchor attached to thespindle c of the hammer D, which, when thus operated, strikes the bell Eto sound the alarm, as hereinafter further set forth. Secured upon theupper extremity of .the shaft a* of the spur-wheel B, outside of thecase A, is an arm, d, extending at right angles thereto, and havingformed in one side, near the outer extremity thereof, a notch or cavity,as shown at a. Provided upon the adjacent surface of the case A, at asuitable distance from the end of the arm d, when the latter is placedin the position shown in fig. 1, is an upright spur, c, in the innerside of which is formed a notch or recess, 6, corresponding in characterto that provided in the extremity of the arm 01, as just 'set forth. Frepresents a toggle-brace, composed of two bars fg, pivoted as shown ata, one of the said bars being furnished 'with a lip, d, at one edge, soarranged that when the two bars are placed in line with each other, asshown in the drawing, the said lip will prevent the bars from turningupon the pivot c in one direction. The same bar has attached to it, atthe same side thereof as that at which thc lip d.is formed, thetripping-cord G, which is also attached to or connected with the door orwindow which it is designed to protect, by sounding the alarm when anattempt is made to open the same. I

When thedevice or apparatus is wound up for use, the toggle-brace, inthe straight condition shown in the drawings, is placed witlrthe twopointed and opposite outer ends of its two bars, one in the recess a ofthe arm d, and the other in the similar recess of the spur e, in whichposition it holds the arm 11, and consequentlythe striking or soundingmechanism connected therewith in a stationary condition, until a pullupon the trippingcord, caused by the movement of the window or door withwhich the said cord is connected, causes the two bars to turn upon theirconnecting-pivot, or, in other words, to be doubled toward each other,thus releasing the arm (1, whereupon the spur-wheel B, being rotated byits spring, hereinbefore mentioned, actuatos the hammer to strike thebell and sound the alarm. Inasmuch as that side or edge of thetoggle-brace, to wnioh the trippingcord is attached, may be turned inany direction around the longitudinal axis of the said brace, when inits straight condition, it follows that the aforesaid tripping-cord maylie carried inany desired direction to the door or window, withoutimpairing its efliciency in tripping or operating the said toggle-brace,as hereinbefore fully set forth. I

What I claim as my invention, and desire to secure by Letters Patent,is-

The toggle-brace, in combination with the arm d, connected with thestriking mechanism of a burglar-alarm, substantially as and for thepurpose herein set forth.

E. of c. KELLOGG.

Witnesses:

'M. E. MERRILL,

WM. L. Humour.

